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Figure 4.4.7
On the screen you will see the following data:
1 – table header line
2 – selected line
3 – channel information
4 – command line with commands activated by F1, F2 and F3 functional keys
5 – scroll bar
Three views of the table are available, for basic and additional parameters. You can
switch between these views by ◄ and ► arrows. The top line of the table (position 1)
divides the table into columns. In basic parameters screen (Figure 4.4.7) the first column is
the channel number. The second column is the channel name. The third column is the
video carrier frequency for analog channels or central frequency for digital channels (with
rounding up to 0.1 MHz). The fourth column is video carrier level or digital channel level in
dB V, dBmV or dBm depending on the preset units. In the next additional parameters
screen (Figure 4.4.8) the first column is the channel number, the second column
represents C/N ratio (in dB). The third column is V/A ratio (in dB). The fourth column
displays MER (in dB) and the fifth column displays preBER values. In the last additional
parameters screen (Figure 4.4.9) the first column is the channel number, the second
column represents MER (in dB). The third and fourth columns are preBER and postBER
values accordingly. For digital channels you will see «--» in the C/N and VA columns, and
for analog channels «--» in the MER and BER columns. If the noise measurement has
been disabled for one of the analog or digital channels, «--» will display in the second
column for this channel. If DVB-T demodulator synchronization with digital channel has
not been achieved during its measurement, the unlocked icon
and BER columns.
The bottom line (position 4) contains the commands that you can activate by the
function keys.
Press
or
keys to select the required channel. The selection will be framed (position
2).
The list of available commands:
a) F1 key to start the data log of the plan selected
b) F2 key to view the measurement results in SCAN measurement mode (Section
4.3.3);
c) F3 key to view and edit the plan limits.
To start data logging, press the F1 key. Set the desired AMP power supply voltage in
the screen that appears, as described in section 4.3.8, and then press F3/Exit. Measuring
process will be indicated by a progress bar. After the measuring is completed, the new
values will appear in the measurement result field of the screen. If the channel name is
highlighted in inverse color (position 3), this indicates that the errors have been detected in
this channel during the check against the plan limits. Incorrect parameters are also
highlighted in inverse color.
To identify the errors, activate the plan limit manager (F3 key). The table of plan limit
parameters will appear on the screen (Figure 4.4.10).
22
Figure 4.4.8
Figure 4.4.9
will appear in the MER
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